Cleaning 15 years’ worth of congealed oil and water off all substrates was the biggest challenge. For waterproofing slurries to bond, substrates must be 100% free of dust, dirt and oil.
It took several days of high-power washing, scrubbing with detergents and hoovering of the space before it was ready for waterproofing.
As the factory was still working, all works had to be carried out at the weekends.